Theodore f



(No Model.)

T. P. Mvxs.

PAN.

Patented Feb; 7, 1893:

W/TNESSES:

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THEODORE l DAVIS, 0F MARSHALLTOXVN, IOWA FAN.

SPECIFICATION forming part of Letters Patent No. 491,407, dated February7, 1893.

Application filed June 28, 1892, Serial No. 438,313. (No model.)

To 00% whom it may concern:

Be it known that I, Tnnononn F. DAVIS, of ldarshalltown, in the countyof Marshall and State of Iowa, have invented a new and Improved Fan, ofwhich the following is a full, clear, and exact description.

My invention relates to improvements in that class of fans which areused upon grain separators to blow the grain and chaff upon and over theriddles and sieves. The fans which are usually employed for this purposehave their air openings at the sides, that is, around the drivingshafts, and as a result, the most effective current of air is producednear the center of the fan so that there is an unequal current blownover the riddles or sieves, and the grain in the center of the fanmillis likely to be blown entirely over the riddles, while at the sides itisnot blown sufficiently hard and the grain is imperfectly cleaned. v

The object of my invention is to produce a fan having an air opening theentire width of the fan blades and parallel with the axis of the fan, sothat there is a perfectly equal and even current of air generated by thefan, and this enables the grain to be perfectly cleaned.

A further object of my invention is to construct a cap or damper for theopening, which may be nicely controlled so as to admit j ust the desiredamount of air to the fan casing.

To this end, my invention consists in a fan, the construction of whichwill be hereinafter described and claimed.

Reference is to be had to the accompanying drawings forming a part ofthis specification, in which similar figures of reference indicatecorresponding parts in both views.

Figure 1 is a perspective view of the fan embodying my invention; andFig. 2 is a vertical section on the line 22 in Fig. 1.

The fan 10, is of the usual kind, and is carried by a shaft 11, whichhas a driving pulley 12 at one end. The fan is inclosed by a casing 13,which is made to deliver at the re quired point, and the casing has oneend rounded, as shown at 14, and the fan is held to revolve in thisrounded end and tits nicely therein. Near the end of the casing andabove the fan, is a slot or opening 15, which extends the entire widthof the casing, as shown by dotted lines in Fig.1, and this open ing iscovered by a swinging cap 16, which is hinged to the casing near thetop, as shown at 17, and has side flanges 18 adapted to fit closelyagainst the sides of the casing.

Any suitable mechanism may be used for holding the damper 16 in therequired position, but the device shown is preferably employed.

On the end portion of the casing 13 and near opposite edges in ahorizontal line, are sliding spring bolts 20 which move in keepers 21and which are secured to inwardly ex tending wires or cords 22, and thelatter are fastened to a common loop 23. The spring bolts are adapted toengage notches 19 in the lower edges of the flanges 18, and by pullingupon the loop 23, the bolts are withdrawn from the notches and byreleasing the bolts their springs throw them into engagement with thenotches. It will be seen that by adjusting this cap or damper 16, justthe required amount of air may be admitted to the casing 13, and the airwill be admitted alike to all parts of the fan. It follows, then, thatthe current of air forced outward from the casing 13 will be just asstrong at the sides of the casing as in the center, and consequentl ythe fan may be adjusted so as to clean the grain perfectly and blow thegrain and chaff the required distance and no farther.

Where fans are used which have side openings and are attached tothrashing machines and separators used in the open air itis oftenimpossible to use the machines in windy days, as the air is blown intothe fan casing with such force as to render the currents within thecasing so variable that no good result can be obtained from it, but withthe construction shown and described above, a direct current of aircannot blow into the opening 15, but the required amount is drawn in bythe movement of the fan.

In the drawings 1 have shown the opening 15 in the upper part of thecasing, but it will be understood that for an under-shot fan, theopening will be produced on the under side of the casing. 7

Having thus described my invention, I claim as new, and desire to secureby Letters Patent,

1. The combination with the elongated casing closed at the sides andhaving a trans IOO verse slot in one end of the fan held to revolve inthe casing and the hood-like damper held to embrace the end of thecasing and cover the slot, the damper being adjustable to and from theslot, substantially as described.

2. The combination with the elongated casing having closed sides and atransverse end opening, of a hood-like damper pivoted 0n the casing andarranged to swing over the open ing, the damper having side flanges toem- 10 brace the casing, and means for adjusting the damper to and fromthe opening in the easing, substantially as described.

THEODORE F. DAVIS. lVitnesses:

E. L. MoNonoN, A. B. MASTERSON.

